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<div id=Content><div class="CSection"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="NewACIndicators"></a>NewACIndicators</h1><div class=CBody><p>Components that allow to implement gain/volume indicators which may provide the dynamic gain/loudness data for your GUI.</p><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#NewACIndicators" >NewACIndicators</a></td><td class=SDescription>Components that allow to implement gain/volume indicators which may provide the dynamic gain/loudness data for your GUI.</td></tr><tr class="SClass"><td class=SEntry><a href="#TGainIndicator" >TGainIndicator</a></td><td class=SDescription>Calculates the perceived gain (loudness). </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#TGainIndicator.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#TGainIndicator.GainValue" >GainValue</a></td><td class=SDescription>Returns the current gain value. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#TGainIndicator.Interval" >Interval</a></td><td class=SDescription>Use this property to set the interval (in milliseconds) between two gain value updates and <a href="#TGainIndicator.OnGainData" class=LProperty id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OnGainData</a> events. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#TGainIndicator.OnGainData" >OnGainData</a></td><td class=SDescription>OnGainData event is called periodically with the period of approximately the <a href="#TGainIndicator.Interval" class=LProperty id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">Interval</a> milliseconds. </td></tr><tr class="SClass"><td class=SEntry><a href="#TFastGainIndicator" >TFastGainIndicator</a></td><td class=SDescription>Calculates the perceived gain (loudness). </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#TFastGainIndicator.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#TFastGainIndicator.GainValue" >GainValue</a></td><td class=SDescription>Returns the current gain value. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#TFastGainIndicator.Interval" >Interval</a></td><td class=SDescription>Use this property to set the interval (in milliseconds) between two gain value updates and <a href="#TFastGainIndicator.OnGainData" class=LProperty id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">OnGainData</a> events. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#TFastGainIndicator.OnGainData" >OnGainData</a></td><td class=SDescription>OnGainData event is called periodically with the period of approximately the <a href="#TFastGainIndicator.Interval" class=LProperty id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">Interval</a> milliseconds. </td></tr><tr class="SClass"><td class=SEntry><a href="#TSpectrumIndicator" >TSpectrumIndicator</a></td><td class=SDescription>This component calculates a rough 8-point spectrum of the audio data passing through. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#TSpectrumIndicator.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#TSpectrumIndicator.Levels" >Levels</a></td><td class=SDescription>Returns 8 level values for the spectrum. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#TSpectrumIndicator.Interval" >Interval</a></td><td class=SDescription>Use this property to set the interval (in milliseconds) between two data updates and <a href="#TSpectrumIndicator.OnGainData" class=LProperty id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">OnGainData</a> events. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#TSpectrumIndicator.OnGainData" >OnGainData</a></td><td class=SDescription>OnGainData event is called periodically with the period of approximately the <a href="#TSpectrumIndicator.Interval" class=LProperty id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">Interval</a> milliseconds. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CClass"><div class=CTopic><h2 class=CTitle><a name="TGainIndicator"></a>TGainIndicator</h2><div class=CBody><p>Calculates the perceived gain (loudness).&nbsp; Descends from <a href="ACS_Classes-pas.html#TAuConverter" class=LClass id=link9 onMouseOver="ShowTip(event, 'tt7', 'link9')" onMouseOut="HideTip('tt7')">TAuConverter</a>.&nbsp; This component provides you the perceived gain for the audio data passing through.&nbsp; One possible use of this component is in an audio-recording program to indicate the level of the incoming signal.&nbsp; This component may also be useful when doing precise gain control.&nbsp; Only one instance of the component may be used in an application.&nbsp; See the DirectSoundRecorder demo for an example.&nbsp; The component requires libgain.dll.</p><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SGroup"><td class=SEntry><a href="#TGainIndicator.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent1 SMarked"><td class=SEntry><a href="#TGainIndicator.GainValue" >GainValue</a></td><td class=SDescription>Returns the current gain value. </td></tr><tr class="SProperty SIndent1"><td class=SEntry><a href="#TGainIndicator.Interval" >Interval</a></td><td class=SDescription>Use this property to set the interval (in milliseconds) between two gain value updates and <a href="#TGainIndicator.OnGainData" class=LProperty id=link7 onMouseOver="ShowTip(event, 'tt1', 'link7')" onMouseOut="HideTip('tt1')">OnGainData</a> events. </td></tr><tr class="SProperty SIndent1 SMarked"><td class=SEntry><a href="#TGainIndicator.OnGainData" >OnGainData</a></td><td class=SDescription>OnGainData event is called periodically with the period of approximately the <a href="#TGainIndicator.Interval" class=LProperty id=link8 onMouseOver="ShowTip(event, 'tt2', 'link8')" onMouseOut="HideTip('tt2')">Interval</a> milliseconds. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="TGainIndicator.Properties"></a>Properties</h3></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="TGainIndicator.GainValue"></a>GainValue</h3><div class=CBody><p>Returns the current gain value.&nbsp; This value is calculated in abstract units in logarithmic scale and varies from 0 (silence) to 60 (the maximum loudness).</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="TGainIndicator.Interval"></a>Interval</h3><div class=CBody><p>Use this property to set the interval (in milliseconds) between two gain value updates and <a href="#TGainIndicator.OnGainData" class=LProperty id=link10 onMouseOver="ShowTip(event, 'tt1', 'link10')" onMouseOut="HideTip('tt1')">OnGainData</a> events.&nbsp; This value sets the minimal interval between updates.&nbsp; The actual interval could be slightly longer depending on the system load.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="TGainIndicator.OnGainData"></a>OnGainData</h3><div class=CBody><p>OnGainData event is called periodically with the period of approximately the <a href="#TGainIndicator.Interval" class=LProperty id=link11 onMouseOver="ShowTip(event, 'tt2', 'link11')" onMouseOut="HideTip('tt2')">Interval</a> milliseconds.&nbsp; You can use this event to update your GUI gain indicators with the current <a href="#TGainIndicator.GainValue" class=LProperty id=link12 onMouseOver="ShowTip(event, 'tt8', 'link12')" onMouseOut="HideTip('tt8')">GainValue</a>.&nbsp; The general responsiveness of the GUI gain indicator depends on the <a href="#TGainIndicator.Interval" class=LProperty id=link13 onMouseOver="ShowTip(event, 'tt2', 'link13')" onMouseOut="HideTip('tt2')">Interval</a> and on the system I/O latency.&nbsp; For the smooth operation the latency should be set to about of 0.05 second and the <a href="#TGainIndicator.Interval" class=LProperty id=link14 onMouseOver="ShowTip(event, 'tt2', 'link14')" onMouseOut="HideTip('tt2')">Interval</a> should be set to about 50.&nbsp; See the TDxAudioIn/TDxAudioOut FramesInBuffer and PollingInterval properties for setting the latency under DirectSound.</p></div></div></div>

<div class="CClass"><div class=CTopic><h2 class=CTitle><a name="TFastGainIndicator"></a>TFastGainIndicator</h2><div class=CBody><p>Calculates the perceived gain (loudness).&nbsp; Descends from <a href="ACS_Classes-pas.html#TAuConverter" class=LClass id=link17 onMouseOver="ShowTip(event, 'tt7', 'link17')" onMouseOut="HideTip('tt7')">TAuConverter</a>.&nbsp; This component provides you the gain (averaged sum of squares) for the audio data passing through.&nbsp; One possible use of this component is in an audio-recording program to indicate (roughly) the level of the incoming signal.&nbsp; Use TGainIndicator for more precise measurements.</p><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SGroup"><td class=SEntry><a href="#TFastGainIndicator.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent1 SMarked"><td class=SEntry><a href="#TFastGainIndicator.GainValue" >GainValue</a></td><td class=SDescription>Returns the current gain value. </td></tr><tr class="SProperty SIndent1"><td class=SEntry><a href="#TFastGainIndicator.Interval" >Interval</a></td><td class=SDescription>Use this property to set the interval (in milliseconds) between two gain value updates and <a href="#TFastGainIndicator.OnGainData" class=LProperty id=link15 onMouseOver="ShowTip(event, 'tt3', 'link15')" onMouseOut="HideTip('tt3')">OnGainData</a> events. </td></tr><tr class="SProperty SIndent1 SMarked"><td class=SEntry><a href="#TFastGainIndicator.OnGainData" >OnGainData</a></td><td class=SDescription>OnGainData event is called periodically with the period of approximately the <a href="#TFastGainIndicator.Interval" class=LProperty id=link16 onMouseOver="ShowTip(event, 'tt4', 'link16')" onMouseOut="HideTip('tt4')">Interval</a> milliseconds. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="TFastGainIndicator.Properties"></a>Properties</h3></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="TFastGainIndicator.GainValue"></a>GainValue</h3><div class=CBody><p>Returns the current gain value.&nbsp; This value is calculated in abstract units in logarithmic scale and varies from 0 (absolute silence) to 10000 (the maximum loudness).</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="TFastGainIndicator.Interval"></a>Interval</h3><div class=CBody><p>Use this property to set the interval (in milliseconds) between two gain value updates and <a href="#TFastGainIndicator.OnGainData" class=LProperty id=link18 onMouseOver="ShowTip(event, 'tt3', 'link18')" onMouseOut="HideTip('tt3')">OnGainData</a> events.&nbsp; This value sets the minimal interval between updates.&nbsp; The actual interval could be slightly longer depending on the system load.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="TFastGainIndicator.OnGainData"></a>OnGainData</h3><div class=CBody><p>OnGainData event is called periodically with the period of approximately the <a href="#TFastGainIndicator.Interval" class=LProperty id=link19 onMouseOver="ShowTip(event, 'tt4', 'link19')" onMouseOut="HideTip('tt4')">Interval</a> milliseconds.&nbsp; You can use this event to update your GUI gain indicators with the current <a href="#TFastGainIndicator.GainValue" class=LProperty id=link20 onMouseOver="ShowTip(event, 'tt9', 'link20')" onMouseOut="HideTip('tt9')">GainValue</a>.&nbsp; The general responsiveness of the GUI gain indicator depends on the <a href="#TFastGainIndicator.Interval" class=LProperty id=link21 onMouseOver="ShowTip(event, 'tt4', 'link21')" onMouseOut="HideTip('tt4')">Interval</a> and on the system I/O latency.&nbsp; For the smooth operation the latency should be set to about of 0.05 second and the <a href="#TFastGainIndicator.Interval" class=LProperty id=link22 onMouseOver="ShowTip(event, 'tt4', 'link22')" onMouseOut="HideTip('tt4')">Interval</a> should be set to about 50.&nbsp; See the TDxAudioIn/TDxAudioOut FramesInBuffer and PollingInterval properties for setting the latency under DirectSound.</p></div></div></div>

<div class="CClass"><div class=CTopic><h2 class=CTitle><a name="TSpectrumIndicator"></a>TSpectrumIndicator</h2><div class=CBody><p>This component calculates a rough 8-point spectrum of the audio data passing through.&nbsp; It may be used to build a simple audio visualisation.&nbsp; Descends from <a href="ACS_Classes-pas.html#TAuConverter" class=LClass id=link25 onMouseOver="ShowTip(event, 'tt7', 'link25')" onMouseOut="HideTip('tt7')">TAuConverter</a>.</p><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SGroup"><td class=SEntry><a href="#TSpectrumIndicator.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent1 SMarked"><td class=SEntry><a href="#TSpectrumIndicator.Levels" >Levels</a></td><td class=SDescription>Returns 8 level values for the spectrum. </td></tr><tr class="SProperty SIndent1"><td class=SEntry><a href="#TSpectrumIndicator.Interval" >Interval</a></td><td class=SDescription>Use this property to set the interval (in milliseconds) between two data updates and <a href="#TSpectrumIndicator.OnGainData" class=LProperty id=link23 onMouseOver="ShowTip(event, 'tt5', 'link23')" onMouseOut="HideTip('tt5')">OnGainData</a> events. </td></tr><tr class="SProperty SIndent1 SMarked"><td class=SEntry><a href="#TSpectrumIndicator.OnGainData" >OnGainData</a></td><td class=SDescription>OnGainData event is called periodically with the period of approximately the <a href="#TSpectrumIndicator.Interval" class=LProperty id=link24 onMouseOver="ShowTip(event, 'tt6', 'link24')" onMouseOut="HideTip('tt6')">Interval</a> milliseconds. </td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="TSpectrumIndicator.Properties"></a>Properties</h3></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="TSpectrumIndicator.Levels"></a>Levels</h3><div class=CBody><p>Returns 8 level values for the spectrum.&nbsp; The index value should be in the range of 0-7.&nbsp; The levels are logarithmic scale values ranging from -40 (minimum) to 100 (maximum).&nbsp; In practice you can consider anything below zero as silence.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="TSpectrumIndicator.Interval"></a>Interval</h3><div class=CBody><p>Use this property to set the interval (in milliseconds) between two data updates and <a href="#TSpectrumIndicator.OnGainData" class=LProperty id=link26 onMouseOver="ShowTip(event, 'tt5', 'link26')" onMouseOut="HideTip('tt5')">OnGainData</a> events.&nbsp; This value sets the minimal interval between updates.&nbsp; The actual interval could be slightly longer depending on the system load.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="TSpectrumIndicator.OnGainData"></a>OnGainData</h3><div class=CBody><p>OnGainData event is called periodically with the period of approximately the <a href="#TSpectrumIndicator.Interval" class=LProperty id=link27 onMouseOver="ShowTip(event, 'tt6', 'link27')" onMouseOut="HideTip('tt6')">Interval</a> milliseconds.&nbsp; You can use this event to update your GUI spectrum indicators with the current <a href="#TSpectrumIndicator.Levels" class=LProperty id=link28 onMouseOver="ShowTip(event, 'tt10', 'link28')" onMouseOut="HideTip('tt10')">Levels</a>.&nbsp; The general responsiveness of the GUI indicator depends on the <a href="#TSpectrumIndicator.Interval" class=LProperty id=link29 onMouseOver="ShowTip(event, 'tt6', 'link29')" onMouseOut="HideTip('tt6')">Interval</a> and on the system I/O latency.&nbsp; For the smooth operation the latency should be set to about of 0.05 second and the <a href="#TSpectrumIndicator.Interval" class=LProperty id=link30 onMouseOver="ShowTip(event, 'tt6', 'link30')" onMouseOut="HideTip('tt6')">Interval</a> should be set to about 50.&nbsp; See the TDxAudioIn/TDxAudioOut FramesInBuffer and PollingInterval properties for setting the latency under DirectSound.</p></div></div></div>

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<div class=CToolTip id="tt1"><div class=CProperty>OnGainData event is called periodically with the period of approximately the Interval milliseconds. </div></div><div class=CToolTip id="tt2"><div class=CProperty>Use this property to set the interval (in milliseconds) between two gain value updates and OnGainData events. </div></div><div class=CToolTip id="tt3"><div class=CProperty>OnGainData event is called periodically with the period of approximately the Interval milliseconds. </div></div><div class=CToolTip id="tt4"><div class=CProperty>Use this property to set the interval (in milliseconds) between two gain value updates and OnGainData events. </div></div><div class=CToolTip id="tt5"><div class=CProperty>OnGainData event is called periodically with the period of approximately the Interval milliseconds. </div></div><div class=CToolTip id="tt6"><div class=CProperty>Use this property to set the interval (in milliseconds) between two data updates and OnGainData events. </div></div><div class=CToolTip id="tt7"><div class=CClass>Descends from TAuInput, the base class for all converter components. </div></div><div class=CToolTip id="tt8"><div class=CProperty>Returns the current gain value. </div></div><div class=CToolTip id="tt9"><div class=CProperty>Returns the current gain value. </div></div><div class=CToolTip id="tt10"><div class=CProperty>Returns 8 level values for the spectrum. </div></div><!--END_ND_TOOLTIPS-->




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